[Interpreter] Add support for loading literals from the constant pool.

src/compiler/interpreter-assembler.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 #define V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
@@ skipping 19 matching lines @@
 class Schedule;
 
 class InterpreterAssembler {
  public:
   InterpreterAssembler(Isolate* isolate, Zone* zone,
                        interpreter::Bytecode bytecode);
   virtual ~InterpreterAssembler();
 
   Handle<Code> GenerateCode();
 
+  // Returns the Idx immediate for bytecode operand |operand_index| in the
+  // current bytecode.
+  Node* BytecodeOperandIdx(int operand_index);
   // Returns the Imm8 immediate for bytecode operand |operand_index| in the
   // current bytecode.
   Node* BytecodeOperandImm8(int operand_index);
   // Returns the register index for bytecode operand |operand_index| in the
   // current bytecode.
   Node* BytecodeOperandReg(int operand_index);
 
   // Accumulator.
   Node* GetAccumulator();
   void SetAccumulator(Node* value);
 
   // Loads from and stores to the interpreter register file.
   Node* LoadRegister(Node* reg_index);
   Node* StoreRegister(Node* value, Node* reg_index);
 
   // Constants.
   Node* Int32Constant(int value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
   Node* HeapConstant(Unique<HeapObject> object);
 
   // Tag and untag Smi values.
   Node* SmiTag(Node* value);
   Node* SmiUntag(Node* value);
 
+  // Load constant at |index| in the constant pool.
+  Node* LoadConstantPoolEntry(Node* index);
+
   // Load a field from an object on the heap.
   Node* LoadObjectField(Node* object, int offset);
 
   // Load |slot_index| from a context.
   Node* LoadContextSlot(Node* context, int slot_index);
 
   // Load |slot_index| from the current context.
   Node* LoadContextSlot(int slot_index);
 
   // Call JS builtin.
@@ skipping 55 matching lines @@
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_ASSEMBLER_H_